According to sources close to droid-life.com, the Motorola Xoom with 4G LTE support will be arriving sometime during September.

Existing owners of the Xoom can supposedly upgrade their tablet through Motorola free of charge. The process would involve backing up important files and then shipping the device to Motorola where it will be hardwired with a 4G module.

The 4G upgrade for the Xoom was reported way back in early March not long after the launch of the tablet, so Verizon is definitely more than a bit late on its promises to Xoom early adopters. The 4G Xoom passed the FCC earlier this month, however, so at least the process is moving along swiftly.